The speaker explains that low-frequency vocal tones (e.g., a low or late-night radio voice) cause listeners' neurons to fire at lower frequencies — a process called neural entrainment — which alters the listeners' emotional tone. High-frequency vocal sounds do not entrain neurons in the same way, so low frequencies have a distinct emotional influence on listeners.
Low frequency sounds of the sort that your voice is, that late night FM DJ voice are responded to in the brain by neurons. No surprise there. But the frequency that those neurons fire is also low frequency. In other words, when you speak in your low voice, the other person's brain hears that and starts firing in a low frequency tone. In other words, it entrains to your voice not just the timing, but it's actually like you're essentially playing an emotional piano down in the low keys of their mind. Now, when you go up to the high frequencies, the neurons can't follow that high frequency. So there's something special about low frequency sound that actually changes the emotional tone of the people that hear that low frequency sound.
